Move wizard list generating helper methods to IWizard.

They don't have anything to do specifically with file wizards.

src/plugins/coreplugin/dialogs/iwizard.h

@@ -62,6 +62,11 @@ public:
     virtual QString trCategory() const = 0;
 
     virtual QStringList runWizard(const QString &path, QWidget *parent) = 0;
+
+    // Utility to find all registered wizards
+    static QList<IWizard*> allWizards();
+    // Utility to find all registered wizards of a certain kind
+    static QList<IWizard*> wizardsOfKind(Kind kind);
 };
 
 } // namespace Core